Plumbing fitting



FIG. 1 is an elevational view taken from one end of a plumbing fitting showing my new design;

FIG. 2 is an elevational view taken from one side thereof, the opposite side being a mirror image of the side shown;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a cross-sectional view taken on line 4--4 of FIG. 3. 

The ornamental design for a plumbing fitting, substantially as shown and described. 